If you’re looking for reasons your relationship is going south, look no further than your checkbook. That’s the suggestion in “Financial Infidelity” by Bonnie Eaker Weil, a therapist who reportedly has a 98 percent success rate with couple who see her (that is to say, 98 percent of them stay together). In this book (she also wrote “Make Up Don’t Break Up” and “Adultery the Forgivable Sin” she explains that money issues are the No. 1 threat to a relationship. She gets into issues like “secret spending” and “revenge shopping,” as well a gambling and people who maintain secret bank accounts.  The book is available April 17.

In fiction, Anne Perry, who is wonderful, returns with “Buckingham Palace Gardens,” her latest in the Thomas and Charlotte Pitt series. They are a husband and wife detective team living in Victorian England. In this one, Thomas is called into Buckingham Palace to investigate the murder of a prostitute apparently hired by one of the wealthy men staying at the palace.

Also new in fiction is Barrington Street Blues, the third novel from Anne Emery. Emery, who lives in Halifax, sets this one there, as police investigate the murders of a rich man and a poor man found dead of gunshot wounds outside a seedy bar.